Interrupt Problems

Hi,

I have been having interrupt related problems with various subsystems.  I 
suspect this is related to the changes in the event timer infrastructure.  

The subsystems that have experienced interrupt problems:
 - hda: this is the easiest to reproduce and what I used to isolate the 
commits.  I get ``pcm0: chn_write(): pcm0:virtual:dsp0.vp0: play interrupt 
timeout, channel dead'' reported and sound no longer plays.
 - nfe: this has happened on occasion with no reliable way to reproduce.  
``watchdog timeouts'' are reported.  After this happens all network traffic dies 
and doing `ifconfig nfe0 down; ifconfig nfe0 up' panics the computer.
 - dc: same thing as above.  
 - nvidia: has reported interrupt timeouts.  This is independent of the 
locking problem (that is fixed with recently published patch).  No reliable way 
to reproduce, appears to happen when under heavy load.  X freezes as a result.  
 - ata: I had a HDD detach twice.  I am not sure if this is related.  I have 
two HDD, each attached to a different controller.  

I tested this by using a kernel built from a cvsup date of 2010/06/20 and 
2010/06/22 (at midnight for both, aka 00:00:00).  The former kernel does not 
exhibit any problems while the latter does.  This problem is also present with 
a kernel from today.  

The motherboard is a N650SLI-DS4L with one graphics card.  See attached for 
more system information.  

Is there anything I can do to help diagnose the problem?  

Regards,

David